A multi-functional complementary continuous combined drying system

Abstract

The application provides a multi-energy complementary continuous combined drying system, which comprises a rack main body, a through drying chamber is formed in the rack main body, a conveying belt assembly is arranged in the drying chamber and penetrates the feeding end and the discharging end of the drying chamber, the conveying belt assembly is driven by a transmission system, and a multi-energy complementary drying area is arranged in the drying chamber, wherein a microwave system, an infrared heating system and a hot air heating system are arranged in the area. The system is combined with the three energy forms of microwave heating, infrared heating and hot air heating which have different heat transfer mechanisms through comprehensive analysis of the heating characteristics and moisture migration law of the materials in different stages of the drying process, and the three energy forms are coordinately operated under the coordination of a unified control system, so that the problems of low drying efficiency, high unit energy consumption and uneven drying process which are commonly existed in the actual application of the existing drying equipment are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of material drying and heat processing equipment, specifically to a multi-energy complementary continuous combined drying system that integrates microwave heating, infrared heating and hot air circulation, suitable for continuous, efficient and low-energy drying of food and agricultural products. Background Technology

[0002] Drying is a common and crucial unit operation in industrial production, with wide applications across multiple fields. In food processing, whether it's the dehydration of fruits and vegetables or the drying and preservation of meat products, drying processes are indispensable. By removing moisture, they extend the shelf life of food and improve its taste and quality. In agricultural product processing, grains and legumes require drying after harvest to prevent mold and ensure storage quality. In the biopharmaceutical field, the drying of pharmaceutical raw materials and preparations is crucial for ensuring the efficacy and stability of drugs. In chemical materials production, many chemical products require drying to remove solvents or moisture to meet subsequent processing and usage requirements. Drying is equally indispensable in the preparation of new energy materials and functional materials; for example, lithium battery materials and novel functional ceramic materials require precise drying during their preparation. In short, drying processes permeate numerous industrial production stages, their application is widespread and important, directly impacting product quality and production efficiency.

[0003] However, existing drying processes have many problems in practical applications. Most existing industrial drying equipment uses a single heat source for power, and the significant differences in characteristics between different heat sources limit their applicability. For example, infrared drying relies primarily on infrared radiation acting directly on the material surface, causing the material molecules to vibrate and heat up. It has a fast heating rate and sensitive response, making it suitable for surface heating or drying thin layers of materials. However, for materials with greater thickness or in a stacked state, the penetration depth of infrared radiation is limited, making it difficult for energy to transfer to the interior of the material. This results in excessively high surface temperatures and insufficient internal temperatures, affecting the overall drying effect and potentially causing quality defects such as charring and discoloration on the material surface. Microwave drying utilizes the interaction of electromagnetic waves with polar molecules in the material to achieve overall volume heating. It has a fast heating rate and high energy utilization efficiency, making it suitable for rapid dehydration of materials with high moisture content. However, when used alone, due to the uneven distribution of dielectric properties or complex shapes of the material, the microwave field is prone to uneven distribution, leading to localized overheating, thermal runaway, or even charring. Furthermore, when the load varies greatly, energy utilization and operational stability are difficult to guarantee, increasing the difficulty of process control. Moreover, in actual industrial production, the materials to be dried are often of uneven thickness, have large moisture content gradients, complex internal structures, and are sensitive to temperature. When drying food, biomass materials, and functional materials, if the drying process is not properly controlled, problems such as cracking, warping, deformation, charring, loss of nutrients, or decline in functional performance are very likely to occur. A single energy form of drying method is difficult to balance drying efficiency, energy consumption control, and product quality.

[0004] To address the aforementioned issues, existing technologies have implemented several measures. To overcome the limitations of single-heat-source drying, some studies have attempted to combine different heat sources to create combined drying methods. For example, infrared drying is combined with hot air drying. Infrared drying utilizes its rapid heating characteristic to initially heat the material surface, while hot air drying allows the heat to penetrate deeper into the material, improving drying uniformity. Microwave drying is also combined with other drying methods, leveraging its rapid heating advantage to further adjust the drying process and improve efficiency. Some companies are also improving equipment design by optimizing heat source distribution and adding material turning devices to improve the temperature and moisture field distribution during the drying process, thereby increasing drying uniformity and reducing problems such as localized overheating.

[0005] Despite some improvements in existing technologies, shortcomings remain. While combined drying methods integrate the advantages of different heat sources, difficulties exist in the coordinated control of these sources. Precisely coordinating the energy output and timing of each heat source leads to instability in the drying process, making it impossible to consistently maintain a uniform temperature and moisture field distribution. Regarding equipment design improvements, measures such as optimizing heat source distribution and adding material turning devices have improved drying effects to some extent. However, for complex materials and large-scale continuous production, it is still difficult to meet the requirements of efficient, uniform, and low-damage drying. Furthermore, the complex equipment structure increases costs, and the difficulty of operation and maintenance also increases accordingly. Overall, existing technologies still cannot effectively improve drying efficiency, reduce energy consumption, and achieve continuous and controllable drying processes while ensuring stable material quality. More comprehensive technological solutions are urgently needed in this field. Summary of the Invention

[0006] To address the common problems of low drying efficiency, high unit energy consumption, and uneven drying process in existing drying equipment, this invention proposes a multi-energy complementary continuous combined drying system. This system organically combines three energy forms with different heat transfer mechanisms—microwave heating, infrared heating, and hot air heating—through comprehensive analysis of the material's heating characteristics and moisture migration patterns at different stages of the drying process, and operates them collaboratively under the coordinated action of a unified control system.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-energy complementary continuous combined drying system, including a frame body, a through drying chamber formed inside the frame body, a conveyor belt assembly running through the feed end and discharge end of the drying chamber, the conveyor belt assembly being driven by a transmission system, and a multi-energy complementary drying area set in the drying chamber, wherein a microwave system, an infrared heating system, and a hot air heating system are set in the drying chamber.

[0008] Furthermore, the effective working width of the drying chamber is matched with the width of the conveyor belt assembly.

[0009] Furthermore, the microwave system includes a microwave generating unit and a microwave action cavity, and microwave suppressors are provided at the feed end and the discharge end.

[0010] Furthermore, the infrared heating system uses medium- and short-wave infrared radiation tubes, which are suspended above the conveyor belt assembly.

[0011] Furthermore, a hot air heating system is installed at the top of the drying chamber. The hot air heating system is used to deliver temperature-controlled hot air into the drying chamber. The flow direction of the temperature-controlled hot air forms a cross or counter-current heat exchange with the material conveying direction.

[0012] Furthermore, the transmission system consists of a variable frequency motor, a reducer, and a sprocket and chain assembly. The transmission system controls the speed of the conveyor belt according to the moisture content of the material.

[0013] Furthermore, it also includes a control system, which is integrated into the operation panel at the top of the drying chamber. The control system is electrically connected to the microwave system, infrared heating system, hot air heating system, and transmission system.

[0014] Furthermore, it also includes a monitoring system, which is installed at key viewing windows on the side or top of the drying chamber. The monitoring system includes an industrial camera module and temperature and humidity sensors, used to monitor the material status, conveyor belt deviation, and dehumidification status inside the drying chamber in real time.

[0015] Furthermore, the main body of the frame is provided with an inspection door and an observation window on the side, which adopts a quick-release hinge structure.

[0016] Furthermore, the feed end is equipped with a height-adjustable baffle to accommodate material layers of different thicknesses.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention provides a multi-energy complementary continuous combined drying system that integrates three drying methods: a microwave system, an infrared heating system, and a hot air heating system. This achieves the synergistic effect of volume heating, surface temperature stabilization, and convective dehydration, overcoming the limitations of drying with a single heat source. The three heat sources can be flexibly combined in series, parallel, or in a single mode according to the material characteristics, achieving precise matching between energy form and material dehydration characteristics. This significantly improves drying efficiency, drying uniformity, and product quality. At the same time, continuous production is achieved through a conveyor belt assembly, adapting to the needs of large-scale industrial operations.

[0018] Furthermore, matching the effective working width of the drying chamber with the width of the conveyor belt assembly ensures that large quantities of materials are heated evenly and transported smoothly during the drying process, avoiding material accumulation and uneven heating caused by width mismatch, further improving drying uniformity, ensuring the stability of continuous drying operations, and enhancing batch product consistency.

[0019] Furthermore, the microwave generating unit and microwave action cavity of the microwave system can achieve volumetric heating of the moisture inside the material, quickly establish the driving force for internal moisture migration, and improve drying efficiency; the microwave suppressors set at the feed end and discharge end can effectively prevent microwave energy leakage, avoid microwave radiation from causing harm to operators, and significantly improve the safety and reliability of equipment operation.

[0020] Furthermore, the infrared heating system uses medium and short-wave infrared radiation tubes suspended above the conveyor belt assembly. It can quickly apply infrared radiation energy to the surface of the material, stabilize the surface temperature, form a temperature gradient that is conducive to moisture migration, and promote the continuous diffusion of internal moisture to the surface. At the same time, it inhibits the phenomenon of surface moisture re-condensation or crusting, avoids premature hardening of the surface layer to prevent internal moisture from being discharged, improves drying uniformity, inhibits material coking and deformation, and improves product quality.

[0021] Furthermore, the hot air heating system is located at the top of the drying chamber, delivering temperature-controlled hot air into the chamber. The hot air flow direction forms a cross or counter-current heat exchange with the material conveying direction, which can efficiently remove moisture from the surface of the material, achieving balanced dehydration and shaping of the material, and making the moisture content inside and on the surface of the material more consistent. The temperature-controlled hot air design can maintain a dynamic balance of temperature and humidity in the chamber, further improving the uniformity of drying, while avoiding the problems of low efficiency and reduced product quality of traditional hot air drying.

[0022] Furthermore, the transmission system consists of a variable frequency motor, a reducer, and a sprocket and chain assembly. It can steplessly adjust the conveyor belt speed according to the material's moisture content, ensuring that the material's residence time in each drying functional zone is controllable and consistent. This avoids insufficient or excessive drying due to improper conveying speed, ensuring the stability and repeatability of the drying process, adapting to the drying process requirements of materials with different moisture contents, and improving the system's versatility.

[0023] Furthermore, the control system is integrated into the operation panel and electrically connected to each functional system. It can independently set and coordinate the microwave power, infrared intensity, hot air temperature, and transmission speed to achieve individual or coordinated operation of the three energy forms. It can achieve precise parameter matching according to material characteristics and drying process requirements, improve drying efficiency and product quality consistency, and at the same time ensure batch stability and traceability, thereby enhancing the controllability of the system.

[0024] Furthermore, the monitoring system is installed at key viewing positions, using industrial camera modules and temperature and humidity sensors to monitor the material status inside the chamber, conveyor belt deviation, and dehumidification status in real time. It can promptly report equipment malfunctions and problems in the drying process, preventing uneven material drying, conveyor belt deviation, and equipment failure, thereby further improving the safety, reliability, and controllability of the system operation and providing a guarantee for stable drying.

[0025] Furthermore, the main body of the frame is equipped with a quick-release hinged inspection door and observation window on the side, which makes it easy for operators to clean residual materials on the conveyor belt and maintain the internal heating components, reducing the difficulty and cost of equipment maintenance and improving the convenience of equipment maintenance; at the same time, the drying process can be observed in real time through the observation window, which makes it easy to adjust the process parameters in a timely manner to ensure the drying effect.

[0026] Furthermore, the feed end is equipped with a height-adjustable baffle, which can flexibly adapt to different thicknesses of material layers to meet the drying needs of different types and thicknesses of materials, significantly improving the versatility and applicability of the system, expanding the application range of the equipment, and adapting to the drying operations of various materials such as food, agricultural products, and chemical materials. Attached Figure Description

[0027] Figure 1 A front view of a multi-energy complementary continuous combined drying system; Figure 2 A top view of a multi-energy complementary continuous combined drying system; Figure 3 Left view of a multi-energy complementary continuous combined drying system; Figure 4 A side view of a multi-energy complementary continuous combined drying system; Figure 5 A three-dimensional diagram of a multi-energy complementary continuous combined drying system; In the attached diagram: 1. Monitoring system; 2. Microwave system; 3. Infrared heating system; 4. Transmission system; 5. Control system; 6. Hot air heating system; 7. Discharge end; 8. Feed end. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1-5As shown, this invention provides a multi-energy complementary continuous combined drying system, including a frame body, a feed end 8, a discharge end 7, a conveyor belt assembly, a transmission system 4, a microwave system 2, an infrared heating system 3, a hot air heating system 6, a monitoring system 1, and a control system 5. A through-type drying chamber is formed inside the frame body, and the conveyor belt assembly passes through the drying chamber, connecting the feed end 8 and the discharge end 7. The transmission system 4 is installed at the bottom of the frame body to drive the conveyor belt assembly to operate smoothly. The microwave system 2, the infrared heating system 3, and the hot air heating system 6 are integrated and installed in corresponding areas of the drying chamber, forming a multi-energy complementary drying channel. Under the coordinated control of the control system 5, the material is dried using a combination of microwave, infrared radiation, and hot air convection.

[0030] Preferably, the continuous combined drying system has an overall length of approximately 3200 mm (including the total length of 3260 mm extending from both ends), a width of approximately 1200 mm, and a height of approximately 1600 mm, which meets the requirements for industrial continuous production layout. Furthermore, the microwave system 2 includes a microwave generating unit and a microwave action cavity. Microwave energy acts on the high moisture content material entering the system along the material conveying direction. Through the dielectric heating effect of microwaves on the water molecules in the material, the volume of water inside the material is heated, causing the internal temperature of the material to rise preferentially. This creates a driving force for water migration from the inside to the outside of the material, promoting the diffusion of internal water to the surface, which is beneficial for the rapid removal of moisture from the material in the early stage of drying.

[0031] Preferably, the microwave generating unit is an array of several microwave generators, the microwave feed angle is optimized, and microwave suppressors (choke structures) are provided at the feed end 8 and the discharge end 7 to prevent microwave energy leakage and ensure operational safety.

[0032] Furthermore, the infrared heating system 3 uses medium- and short-wave infrared radiation tubes suspended above the conveyor belt. The infrared radiation energy is rapidly applied to the surface of the material, effectively raising the surface temperature and maintaining it relatively stable. The temperature control range is 40℃~120℃. Through non-contact infrared temperature probe feedback closed-loop control, a temperature gradient conducive to moisture migration is formed, promoting the continuous diffusion of moisture from the inside of the material to the surface. At the same time, it inhibits the re-condensation of surface moisture or the crusting phenomenon caused by local overcooling, avoiding premature hardening of the surface and further improving the uniformity and stability of the drying process.

[0033] Furthermore, the hot air heating system 6 includes an air supply component, a heating component, and an air duct structure, which is located at the top of the drying chamber. Controllable temperature hot air is delivered downward through the top air duct. The hot air flow direction forms a cross or counter-current heat exchange with the material conveying direction, and the design wind speed is adjustable. The hot air heating system 6 uses controllable temperature hot air to perform convective heat exchange on the material, realizing the balanced dehydration and shaping treatment of the material, making the internal and surface moisture content of the material tend to be consistent. At the same time, it runs through the entire chamber to realize the rapid removal of moisture from the inside to the outside, maintaining the dynamic balance of temperature and humidity in the chamber.

[0034] Furthermore, the transmission system 4 is installed along the drying channel and consists of a variable frequency motor, a reducer, and a sprocket and chain assembly. It is used to carry and continuously transport the material to be dried, driving the conveyor belt to circulate between the feed end 8 and the discharge end 7, so that the material maintains a stable movement state during the drying process. The speed of the conveyor belt can be steplessly adjusted according to the moisture content of the material, so that the residence time of the material in each drying functional zone is controllable and consistent, avoiding the occurrence of insufficient or excessive drying due to uneven conveying, and ensuring the stability and repeatability of the entire combined drying process.

[0035] Furthermore, the control system 5 is integrated into the operation panel at the top of the drying chamber. It integrates a microwave power control module, an infrared heating adjustment module, a hot air temperature control module, and a conveyor speed control module. It can coordinate and precisely control the microwave system 2, the infrared heating system 3, the hot air heating system 6, and the transmission system 4. This effectively avoids problems such as local overheating and uneven drying caused by overload of a single heat source or energy mismatch. It keeps the entire drying process stable and controllable, significantly improving the overall drying efficiency, material uniformity, and system reliability. It provides core control assurance for continuous, high-quality, and low-energy industrial drying operations.

[0036] Furthermore, the monitoring system 1 is installed on the side or top of the main frame at key viewing windows. This system integrates an industrial camera module and a high-precision temperature and humidity sensor, enabling comprehensive and uninterrupted real-time monitoring of the material status, conveyor belt deviation, and humidity removal within the drying chamber. Simultaneously, it collects and tracks the equipment's operating status and key parameters throughout the drying process, promptly reporting any abnormal information. This effectively prevents equipment failures, uneven material drying, conveyor belt deviation, and other problems, significantly improving the safety, stability, and controllability of the multi-energy complementary combined drying system during continuous operation, providing crucial assurance for the reliable operation of the entire drying equipment.

[0037] Furthermore, the main body of the frame is equipped with an inspection door and observation window on the side, which adopts a quick-release hinge structure to facilitate the cleaning of residual materials on the conveyor belt and the maintenance of the internal heating components; the feed end 8 is equipped with a height-adjustable baffle to accommodate material layers of different thicknesses; the effective working width of the drying chamber matches the width of the conveyor belt assembly, which is suitable for continuous through-flow drying operations of large batches of materials.

[0038] During operation, the material to be dried continuously enters the drying channel from the feed end 8 and moves forward at a uniform speed in the horizontal direction under the drive of the transmission system 4. Based on the dielectric properties, infrared absorption spectrum and thermal property differences of the material, the system can flexibly combine three heat energy input forms: microwave, infrared and hot air, to achieve series time-sharing relay drying, parallel synchronous collaborative drying or single-mode independent drying. Through dynamic adaptation of multiple physical fields, the system can achieve precise matching between the energy form and the dehydration characteristics of the material.

[0039] The material goes through microwave heating, infrared heating and hot air heating stages in sequence. Microwave system 2 first realizes rapid volume heating inside the material to build a driving force for moisture migration; infrared heating system 3 stabilizes the surface temperature of the material and promotes the continuous outward diffusion of internal moisture; hot air heating system 6 completes the balanced dehydration and shaping of the material, so that the moisture content inside and on the surface of the material tends to be consistent.

[0040] Once the material reaches the set moisture content, it is output from the discharge end 7. Through the single or synergistic effects of three energy forms—microwave, infrared, and hot air—in time and space, a high-efficiency, high-quality, and stable drying process is achieved.

[0041] Example 1 This embodiment is suitable for drying foods such as apple slices and potato slices. The main frame of the system is a frame structure, and the conveyor belt assembly adopts a mesh belt. The variable frequency motor and reducer of the transmission system 4 control the speed of the mesh belt, which can be adjusted from 0.1 to 0.3 m / min and can be steplessly adjusted according to the moisture content of the material.

[0042] Microwave system 2 is located at the front of the drying channel, using a 2450MHz microwave source with a rated power of 3kW and continuously adjustable power. The microwave cavity is equipped with a leakage-proof choke structure. Infrared heating system 3 is located behind microwave system 2, using a medium-wave infrared radiator with a single-group power of 1.5kW. It is independently adjustable in each zone, with a temperature control range of 40℃~120℃. Closed-loop control is achieved through a non-contact infrared temperature probe. Hot air heating system 6 is located at the rear of the drying channel, installed on the top of the main frame. The hot air temperature control range is 40~80℃, and the wind speed is adjustable. The hot air flow direction forms a cross heat exchange with the material conveying direction. It is equipped with a circulating air duct and an independent dehumidification port.

[0043] The control system 5 uses a PLC and a touch screen, which are integrated into the operation panel on the upper part of the main frame. The microwave power, infrared power, hot air temperature and conveying speed can be set separately and linked control can be realized. The monitoring system 1 is installed at the key viewing window position on the top of the main frame. Temperature measuring points are arranged in the microwave zone, infrared zone and hot air zone respectively to collect and upload parameters in real time. In case of abnormality, audible and visual alarms are triggered.

[0044] The material to be dried (initial moisture content 75%–85%) is continuously fed in from the feed end 8 and conveyed uniformly at a speed of 0.15 m / min via the transmission system 4. It is first heated by the microwave system 2 to rapidly raise the internal temperature to 50–55°C, forming a moisture migration channel. Then, the surface temperature is stabilized to 55–60°C by the infrared heating system 3 to prevent surface crusting and re-condensation. Finally, it undergoes uniform dehydration and shaping via the hot air heating system 6 at a low to medium wind speed of 55–60°C. The drying time is approximately 20–25 minutes, with the final moisture content controlled at 8%–12%, and the material is output from the discharge end 7. Compared with traditional hot air drying, this embodiment shortens the drying time by more than 50%, reduces energy consumption by more than 30%, and produces material with uniform color, no charring or cracking, and significantly improved nutrient retention.

[0045] Example 2 This embodiment is applicable to the drying of agricultural products such as wheat, corn, and soybeans. The remaining structure is the same as in Embodiment 1, and the transmission speed is 0.2 to 0.3 m / min.

[0046] Microwave system 2 uses an adjustable microwave source with a power of 4-6kW and a working frequency of 915MHz to gently heat the grain materials by volume, avoiding local overheating that could cause them to burst. Infrared heating system 3 uses low-power auxiliary heating to maintain a uniform surface temperature and prevent the surface from becoming damp. Hot air heating system 6 is set to a temperature of 50-65℃, increases the circulating air volume and dehumidification volume, and quickly reduces the moisture content of the grains.

[0047] The initial moisture content of the grain to be dried is 18% to 25%, the drying time is 12 to 18 minutes, the final moisture content is 12% to 14%, the drying uniformity is good, the material breakage rate is less than 1%, there is no mold or overheating damage, it can be processed continuously in large batches, and it is suitable for the high-efficiency operation needs of the grain harvesting season.

[0048] Example 3 This embodiment is applicable to the drying of chemical and new energy functional materials such as catalyst particles, ceramic powders, and battery material precursors. The remaining structure is the same as in Example 1, and the transmission speed is 0.1 to 0.2 m / min.

[0049] Microwave system 2 uses low-power uniform output to avoid thermal runaway of chemical materials with high moisture content; infrared heating system 3 precisely controls the temperature to prevent material agglomeration and hardening; hot air heating system 6 operates at a low temperature of 40-70℃ to enhance dehumidification, reduce thermal shock, and ensure the stability of material crystal form and particle size.

[0050] The initial moisture content of the material to be dried is 15% to 30%, and the moisture content after drying is precisely controlled at 1% to 3%. The material does not agglomerate, does not deteriorate, and is not subject to heat damage. The particle size distribution and crystal structure are stable, meeting the drying requirements of high-end materials.

[0051] Example 4 Based on the above embodiments, in terms of energy coupling control, a multi-energy complementary dynamic adjustment mechanism is established by monitoring the material status in real time through the monitoring system 1. For example, when the microwave segment detects that the material has a high moisture content, the radiation intensity of the subsequent infrared segment and the dehumidification air volume of the hot air segment are automatically increased to form a closed-loop feedback. This structure can provide progressive energy matching when the material changes from a high moisture content state to a low moisture content state, avoiding coking or uneven drying caused by overheating of a single heat source, and improving the consistency of product quality.

[0052] In terms of structural layout, the equipment rack not only serves as a support but also integrates shielding and insulation functions to prevent microwave leakage and heat loss, thereby further improving the system's energy utilization rate (COP).

[0053] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-energy complementary continuous combined drying system, characterized in that, The machine includes a frame body, and a through drying chamber is formed inside the frame body. A conveyor belt assembly is installed in the drying chamber, which runs through its feed end (8) and discharge end (7). The conveyor belt assembly is driven by a transmission system (4). A multi-energy complementary drying area is set in the drying chamber, and a microwave system (2), an infrared heating system (3), and a hot air heating system (6) are set in this area.

2. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The effective working width of the drying chamber is matched with the width of the conveyor belt assembly.

3. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The microwave system (2) includes a microwave generating unit and a microwave action cavity, and microwave suppressors are provided at the feed end (8) and the discharge end (7).

4. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The infrared heating system (3) uses a medium-short wave infrared radiation tube, which is suspended above the conveyor belt assembly.

5. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The hot air heating system (6) is located at the top of the drying chamber. The hot air heating system (6) is used to deliver temperature-controlled hot air into the drying chamber. The flow direction of the temperature-controlled hot air forms a cross or counter-current heat exchange with the material conveying direction.

6. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The transmission system (4) consists of a variable frequency motor, a reducer and a sprocket and chain assembly. The transmission system (4) controls the speed of the conveyor belt according to the moisture content of the material.

7. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, It also includes a control system (5), which is integrated into the operation panel at the top of the drying chamber. The control system (5) is electrically connected to the microwave system (2), the infrared heating system (3), the hot air heating system (6), and the transmission system (4).

8. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, It also includes a monitoring system (1), which is installed on the side or top of the drying chamber at key viewing window positions. The monitoring system (1) includes an industrial camera module and a temperature and humidity sensor, which are used to monitor the material status, conveyor belt deviation and dehumidification status in the drying chamber in real time.

9. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The main body of the frame is equipped with an inspection door and an observation window on the side, and adopts a quick-release hinge structure.

10. The multi-energy complementary continuous combined drying system according to claim 1, characterized in that, The feed end (8) is equipped with a height-adjustable baffle plate to accommodate different thicknesses of the material layer.

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